WASHINGTON — Democrats dispatched party leaders and surrogates in Iowa on Monday to assail the Republican field while paying close attention to Republican Mitt Romney, who has led in national polls. President Barack Obama is expected to compete heavily for Iowa’s voters in next fall’s general election after winning the state’s caucuses in 2008. Obama planned to address Democratic caucus attendees by web video tonight.

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With his choice of restaurant executive Andrew Puzder to serve as his Labor secretary, President-elect Donald Trump has now tapped six big donors and fundraisers to serve in his administration, lining up an unprecedented concentration of wealthy backers for top posts.

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